/**
 * @Author Big_white
 * @Date 2021/11/11
 */
public class Popcorn {

    private static Popcorn instance=new Popcorn();
    public static Popcorn getInstance(){
        return instance;
    }
    public void on(){
        System.out.println("popcorn on");
    }
    public void off(){
        System.out.println("popcorn ff");
    }
    public void pop(){
        System.out.println("popcorn is poping");
    }
}
